Brake mechanism.



T. Iu DUFFY.

BRAKE MECHANISM.

APPLICATION FILED 00w. 28, 1912.

Patanteol (Mat. 21, 1913.

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crasea hriginal application flleddune 5, 1912, Serial No. 70i,72d.Divided and this application filed catcher hit,

1e12, Serialllt'o.728,218.

To all whomt't may concern:

Be it known that ll, THOMAS ll. DUFFY, a citizen of the United States,and a resident of Chicago, in the county ofCook and State of llllinois,have invented new and useful Improvements in Brake Mechanism; and I dohereby declare that the following is a.

Y struction of the parts hereinafter described Kid and more particularly,pointed out in the appended claims. I

- The invention refers more specifically to ah equalizing inechanism foroperating the brake-mechanism for automobile and like constructions ofthat kind in which each rear or driving wheel of the machine isprotitled with bands or shoes so arranged that one bandof each Wheeloperates in a pair with a band of the other wheel, the constructionbeing such that the operation of one pair of hands produces a servicestop and the operation of both pairs produces an emergency stop Theobject of the invention is to Jrovide a simple and efie'ctive operatingmec anism so constructed and arranged that the mechanism may be operatedfor a service stop by the use of a single operating lever or pedal andmay be as quickly operated for an emer gency stop by the use of anothersingle operating iever or brake. V

lln the olrhWingst-Fi gflta 1 is a plan View, paftl diagrammatic,showing the brake mec an-ism and operating means therefor. Fig.12is adetail section showin the connectionof are hrahe rock shafts withthebrake ine'oli'anisin atthe drum. Fig. 3 is a detail sectionillustrating the inner ends offthe' brnheroek shafts and the actuatingarms therefor. Fig. a is a detail illustrating the manner of attachingthe-brake cahles to the rock shaft arms.

As shown in the drawings, 10 designates as a whole the rear axle of thevehicle, 11, 11

ggiipeirate- With the brake bands or shoes, ,1 lhe construction hereinshown is adapted for use with the form of brake mechanism shown in myprior application for U. S. Letters Patent, Serial No. 701,724: filed onthe 5th day of June, 1912, of which the present application-is adivision.

l5, l6 designate brake actuating rock shafts. There are two shafts ateach end of the axle, and one is shown as made hollow to receive theother. The inner brake shaft 16 of each pair is mounted at its inner endin a boss 17 at the side of therear axle gear case 18 and the outer endof the outer or hollow rock shaft 15 is mounted in a bearing 19 carriedby the torque arm 20. The said shafts 15, 16 are provided at their outerends with rigidly connected arms 21, 21 respectively, which armsare-loosely connected to the outer ends of the brake bandbrake bandsinto frictional engagement with the rim of the brake drum. in the use ofthe double brake band construction, the outer bands will usually be usedfor service stops, and for the emergency stops both hands of each brakedrum will be simultaneously set, so as to secure full and simultaneousaction of both bands. in order to o erate said brake bands convenientlyand e ciently for service and emergency stops it employ an equalizerconnection between the rock s fts 15, lo and the actuating pedals orlevers thereof, which is made as follows: flihe cables 28, which areattached at their rear ends to the crank arms 27 of the inner rockshafts, are carried forwardlv and are attached at their forward ends to.the ends of ah eveaer 32 that may be supported on any suitable part ofthe vehicle frame, not shown; 38 designates a link whieh is pivotanyconnected at its rear end at 3% to the evener 32, and is connected atits forward end to a rock shaft that may be operated by a hand lever 36,through which power is applied to act on the inner rock shafts to setthe brake bands connected therewith for service stops. The cables 29,30, of which there is a pair at each side of the device, extendforwardly from two pairs of crank arms 26, 27 of the outer and innerrock shafts, respectively, and the cables of said pairs are connected attheir forward ends with eveners 40, one at each side of the evener 32.The two eveners are connected between their ends by links ll with theends of an equalizing bar 42. 4L5 designates a link'which extendsforwardly from and is pivotally connected at 46 to the middle portion ofthe equalizing bar 42 and the link 45 is connected at its forward endwith a foot pedal actuatedrock shaft 47, as herein shown. When pressureis applied to rock the foot pedal actuated shaft 47, the equalizing bar42 is drawn forwardly which,- in turn, acts through the pair of sideeveners 40, 40 to rock forwardly both pairs of rock shafts and tothereby simultaneously set both pairs of brak bands. Preferably, and asherein shown, the cables 28, 30 which connect the crank arms of theinnerrock shafts with the eveners 40, 32Qat each side of the brake mechanism,are made of a single length'of cable, said cable being attached at itsends to said eveners and threaded between its ends through theconnection to the crank arm of the inner rock shaft. In order to preventthe single length of cable, thus, serving as an independent connectionto eveners, from slipping at its connection to the rock shaft crank arm,I may apply clamping rings to the looped portions of the cables, neartheir connection with said crank arms. Tension devices are applied tosaid cables to maintain the same in proper tension, and preferably saidtension devices are interposed between the cables and the rock shaftcrank arms 26, 27. Such tension device is shown in Fig. 4. It comprisesa stirrup 51 that is connected at its rear end to its associated crankarm by a pivot 52 and is provided at its closed forward end with anopening to receive a headed tube or nipple 53. The forward end of saidnipple is internally screw-threaded to receive the screw-threaded shankof a screw eye 54;, to which the cable is directly attached. The saidnipple 53 fits loosely in the stirrup so that it may turn therein, androtation of said nipple serves, through the screw-threaded connection,to exert the proper tension on the cable.

I claim as my invention 1. A brake mechanism comprising two membersprovided with braking faces, apair of brake elements applied to eachmember,

actuating means connected to one of the brake elements of each pair tosimultaneously cset the same, and other actuating means connected toboth brake elements of each pair for simultaneously setting all thebrake elements, embracing equalizing means between the point ofapplication of power and the two pairs of brake elements.

2. A brake mechanism comprising two members provided with braking faces,a pair of brake elements applied to each member, actuating meansconnected to one of the brake elements of each pair to simultaneouslyset the same, and other actuating means connected to both brake elementsof each pair for simultaneously setting all the brake elements,embracing an equalizing member connected at one end to the two brakeelements of one pair and at its other end to the two brake elements ofthe other pair, with operating means connected to the equalizing memberbetween the ends of the latter.

3. Brake mechanism comprising two mem bers provided with braking faces,a pair of brake elements applied to each member, actuating meansconnected to one of the brake elements of each pair to operate themsimultaneously, embracing an evener with means to draw it forward, anequalizerbar, with means to draw it forward, and a pair of evenersconnected to the ends of the equalizing bar, each of the latter evenersbeing connected at each end to both of the brake elements of one pair.

4. Brake mechanism comprising two members having braking faces, a pairof brake elements applied to each member, a pair of rock shaftsassociated with each member, each pair of the rock shafts having meansto connect them to the brake elements of the associated pair, each pairof rockshafts being provided at their inner ends with crank arms, anevener connected to corresponding crank arms of eachpair of shafts tosimultaneously set the corresponding brake elements of both pairs, anequalizing bar, a pair of eveners, each connected to one end of saidbar, and connections between each latter eveners and both crank arms ofthe rock shafts of an associated pair.

In testimony, that I claim the foregoing as my invention 1 aflix mysignature in the presence of two witnesses, this 18th day of October,1912.

THOMAS I. DUFFY Witnesses:

W. L. HALL, G. E. Down ioo

